OpenE2K/qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

ssh: Support BDRV_REQ_ZERO_WRITE for truncate

Browse Source 
Our .bdrv_has_zero_init_truncate can detect when the remote side
always zero fills; we can reuse that same knowledge to implement
BDRV_REQ_ZERO_WRITE by ignoring it when the server gives it to us for
free.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200428202905.770727-7-eblake@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2020-04-28 15:29:02 -05:00 committed by Kevin Wolf
parent fec00559e7
commit be9c9404db
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
block/ssh.c
View File

@ -883,6 +883,10 @@ static int ssh_file_open(BlockDriverState *bs, QDict *options, int bdrv_flags,
/* Go non-blocking. */
ssh_set_blocking(s->session, 0);
if (s->attrs->type == SSH_FILEXFER_TYPE_REGULAR) {
bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
}
qapi_free_BlockdevOptionsSsh(opts);
return 0;